package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
 *  切面类，用于实现自动填充功能
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill) ")
    public void autoFillPointCut() {
    }


    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行字段填充");
        //获取到数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取注解对象
        OperationType operationType = autoFill.value();//获取数据库操作类型

        //获取到方法参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entry = args[0];
        //准备要赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //对不同的操作方法,通过反射赋不同的值
        if (operationType == OperationType.INSERT) {
            Method setUpdateTime = entry.getClass()
                    .getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setInsertTime = entry.getClass()
                    .getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entry.getClass()
                    .getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            Method setInsertUser = entry.getClass()
                    .getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);

            setUpdateTime.invoke(entry, now);
            setInsertTime.invoke(entry, now);
            setUpdateUser.invoke(entry, currentId);
            setInsertUser.invoke(entry, currentId);

        } else if (operationType == OperationType.UPDATE) {
            Method setUpdateTime = entry.getClass()
                    .getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entry.getClass()
                    .getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setUpdateTime.invoke(entry, now);
            setUpdateUser.invoke(entry, currentId);
        }
    }
}
